package pt.up.beta.mobile.utils;

import java.util.Locale;

/**
 * 
 *
 */
public class StringUtils {

	// private constructor, can't be instanciated!
	private StringUtils() {
	}

	private static final String PLAIN_ASCII = "AaEeIiOoUu" // grave
			+ "AaEeIiOoUuYy" // acute
			+ "AaEeIiOoUuYy" // circumflex
			+ "AaOoNn" // tilde
			+ "AaEeIiOoUuYy" // umlaut
			+ "Aa" // ring
			+ "Cc" // cedilla
			+ "OoUu" // double acute
	;

	private static final String UPPERCASE_ASCII = "AEIOU" // grave
			+ "AEIOUY" // acute
			+ "AEIOUY" // circumflex
			+ "AON" // tilde
			+ "AEIOUY" // umlaut
			+ "A" // ring
			+ "C" // cedilla
			+ "OU" // double acute
	;

	private static final String UNICODE = "\u00C0\u00E0\u00C8\u00E8\u00CC\u00EC\u00D2\u00F2\u00D9\u00F9"
			+ "\u00C1\u00E1\u00C9\u00E9\u00CD\u00ED\u00D3\u00F3\u00DA\u00FA\u00DD\u00FD"
			+ "\u00C2\u00E2\u00CA\u00EA\u00CE\u00EE\u00D4\u00F4\u00DB\u00FB\u0176\u0177"
			+ "\u00C3\u00E3\u00D5\u00F5\u00D1\u00F1"
			+ "\u00C4\u00E4\u00CB\u00EB\u00CF\u00EF\u00D6\u00F6\u00DC\u00FC\u0178\u00FF"
			+ "\u00C5\u00E5" + "\u00C7\u00E7" + "\u0150\u0151\u0170\u0171";

	private static final String UPPERCASE_UNICODE = "\u00C0\u00C8\u00CC\u00D2\u00D9"
			+ "\u00C1\u00C9\u00CD\u00D3\u00DA\u00DD"
			+ "\u00C2\u00CA\u00CE\u00D4\u00DB\u0176"
			+ "\u00C3\u00D5\u00D1"
			+ "\u00C4\u00CB\u00CF\u00D6\u00DC\u0178"
			+ "\u00C5"
			+ "\u00C7"
			+ "\u0150\u0170";

	// remove accentued from a string and replace with ascii equivalent
	public static String convertNonAscii(String s) {
		if (s == null)
			return null;
		StringBuilder sb = new StringBuilder();
		int n = s.length();
		for (int i = 0; i < n; i++) {
			char c = s.charAt(i);
			int pos = UNICODE.indexOf(c);
			if (pos > -1) {
				sb.append(PLAIN_ASCII.charAt(pos));
			} else {
				sb.append(c);
			}
		}
		return sb.toString();
	}

	public static String toUpperCaseSansAccent(String txt) {
		if (txt == null) {
			return null;
		}
		String txtUpper = txt.toUpperCase(Locale.getDefault());
		StringBuilder sb = new StringBuilder();
		int n = txtUpper.length();
		for (int i = 0; i < n; i++) {
			char c = txtUpper.charAt(i);
			int pos = UPPERCASE_UNICODE.indexOf(c);
			if (pos > -1) {
				sb.append(UPPERCASE_ASCII.charAt(pos));
			} else {
				sb.append(c);
			}
		}
		return sb.toString();
	}

	public static String removeChar(String s, char c) {
		StringBuffer r = new StringBuffer(s.length());
		r.setLength(s.length());
		int current = 0;
		for (int i = 0; i < s.length(); i++) {
			char cur = s.charAt(i);
			if (cur != c)
				r.setCharAt(current++, cur);
		}
		return r.toString().trim();
	}

	public static String getAcronym(String s) {
		StringBuffer r = new StringBuffer();
		final String[] words = s.split(" ");
		for (String word : words) {
			if (Character.isUpperCase(word.charAt(0)))
				r.append(word.charAt(0));
		}
		return r.toString();
	}

}
